DE3248544C2 - System for information transmission by means of infrared radiation - Google Patents

Description

IO

- that a vehicle (F) has at least two differently oriented IR-transmitter-Z-receiver combinations (FSEi. FSE2 ...) , with at least two beacons (Bi, B2 ...) that are differently oriented transmission paths (OS 1, ...), whereby the IR transmitter and IR receiver have optics with a fixed opening angle (BWH 1, BWH2; FWH 1. FWH 2; FWV, ÄWV ^,

- that the transmitters (Si, S 2 ...) are connected in parallel and transmit the same data at the same time,

- and in that the receivers (E 1, E2 ...) are connected on the output side in parallel and each having a Störsignalindikator (SI), the denjeni- 2 ·> gen receiver (Ei, E2 ...), blocks whose spurious signals above a predetermined Interference signal threshold are.

2. System according to claim 1, characterized in that the beacons [Bi, B2 ...) each on the right and left side of the road with sending and receiving direction (BSEi, BSEZ) opposite to the direction of travel of the vehicle (F), the IR transmitter / receiver combination (FSE i, FSE2. ..) on the vehicle (F) } ■> are arranged with the sending and receiving direction in the direction of travel.

3. System according to claim t or 2, characterized in that the opening angle or the Scnderkeulen (FWHi, FWH 2, FWH3) of the vehicle-transmitter-ZEmpfängerkombinationen (FSEi, FSE2 ...) overlap in the horizontal direction by a few degrees.

4. System according to claim 1 or 2, characterized in that the opening angle or the transmitter lobes (BWHi, BWH 2) of the beacon transmitter / receiver combination (BSEi, BSE2) largely overlap in the horizontal direction, the entire width of the street being illuminated and the legs of the opening angle, which point towards the middle of the road, reach in the vicinity of the respective opposite beacon (B i or B 2) and form a tear-off edge (A ΛΚ;).

5. System according to claim 1 or 2, characterized in that the opening angle or the radiation angle (BWV, FWV) formed by the transmitter lobe (SK ) in the vertical direction of the transmitter / receiver combinations (BSE, FSE) of the beacon (B) and of the vehicle (F) are almost the same size and form an acute angle of less than 20 °. bo

6. System according to one of the preceding claims, characterized in that the respective receiver (E) of the transmitter-ZEmpfängerkombinationen (BSE 1, BSE2; FSE 1, FSF. 2) one or more IR receiving diodes (IRL) with a downstream t > ^r > th preamplifier (VV), downstream of it, has a voltage comparator (SK) and an interference signal indicator (SI) , the output of which acts on the preamplifier (VV) or the voltage comparator (SK)

7. System according to claim 6, characterized in that the interfering signal indicator (SI) bc \ exceeding a predetermined interfering signal amplitude undZ or a useful interfering signal amplitude ratio blocks the output (A) of the preamplifier (VV) or the voltage comparator (SK)

8. System according to claim 6 or 7, characterized in that the IR receiver input has at least one IR diode (IRL) connected to a supply voltage (U ) and an indicator resistor (Rl) , the one of the IR diode (IRL) and the indicator resistor (Rl) formed voltage divider of the interference signal indicator (SI) is that the IR diode (IRL) is followed by a transistor (Tr) which forms the preamplifier (VV) tuned to the corresponding useful signal frequency range and that the transistor (Tr ) a comparator (K) is connected downstream with a diode (D 1) which is arranged in parallel at its inputs (E 1, E2) and which together form the voltage comparator (SK) .

9. System according to claim 4, characterized in that the tear-off edge (ARK) for determining the exact position of the vehicles (F) OKnX, the beacon transmitter (BSEi, BSE2) from the sudden abortion of the amplitudes received in the vehicle when leaving the transmission range of the relevant beacons (B 1, B 2) the vehicle position is determined.

The invention relates to a system for transmitting information by means of infrared radiation with modulatable information data between stationary beacons and moving vehicles, each equipped with a scanner / receiver combination.

Information transmission by means of infrared radiation is known per se and is used for various purposes, z. B. used for the remote control of television or radio equipment. With such a Application, the transmission path is inside closed rooms, so that the generally no problems caused by bright sunlight. For transmission links outside of closed ones Rooms, such as those that can be used, for example, in a garage door control or in similar applications, must be taken into account ensure that no interference can occur due to bright ambient or sunlight. It must be taken care of be that the infrared receiver is arranged or set up in such a way that no direct or reflected Sunlight reaches the receiving device because it allows reception of infrared signals the transmission path would be made impossible. Through appropriate geometric arrangements the fixed receiver in connection with sun visors and / or filters is an infrared transmission in daylight or in sunlight, albeit with a shorter range is. but which can generally be accepted.

Light transmitter and light receiver, for example on a vehicle, with a different orientation Their radiation characteristics are known from DE-PS 8 33 309, for example. There is a warning

3 4

and monitoring signal system with a receiver, time constant compared to the duration of the useful signal

gj which is large from one at the same installation site. having, wherein the sieve member at the infrared

(| which transmitter is sent out and connected to a warning diode and to a switching transistor

la abundant object leads reflected rays, which via a resistor to an amplifier

la receives, described. The transmitter and the s are switched on. This is to achieve that, ever

P receivers are set to one another in such a way that the greater the incidence of interfering light, the higher the

fi center lines of the opening angle of their beam cone or the speaking threshold of the amplifier is raised. These

^r "at least their projections on the roadway or circuit arrangement has the disadvantage that the

cut to a horizontal plane in the warning area.

fs the. io can be chosen, especially if very large data

\ i From DE-OS 22 54 785 is a method and a ten amount must be transferred per unit of time,

r, ^H Device for transmitting electromagnetic signals such as for example for the transmission of information

ι * radiation, e.g. B. infrared radiation known With this in motor vehicle control systems for individual target

* 'known methods may require a different execution. In addition, this

L, direction of the radiation pattern can be achieved. 15 circuit arrangement even with a very long time

.j The modulated electromagnetic beam constant of the filter element between the interference signal and

r 'development in a spatially variable characteristic useful signal can no longer be distinguished if the

f transmitted so that the sunlight shines directly into the infrared diode in a relatively small area.

transmitted signals by using before the object of the invention is therefore to provide a system for

[Certain codes can be deciphered in order to transmit the information of the type mentioned at the beginning

to receive the desired information, and to indicate the beam, which ensures that even in the event of un-

ment outside this area is such that it is the most favorable stray light, such. B. direct sun

it is impossible to obtain this desired information light falling on the infrared receiving diode, a

ten. interference-free data transmission between transmitter and

In DE-PS 9 77 094 a method for through 25 recipients is possible.

Radiation of air or other absolute measuring This task is mentioned at the beginning serve from a weakly bundled transmitter to a system for information transmission according to the invention Undirected receiver by means of light pulses achieved in that a vehicle does not write at least two. In order to have differently aligned infrared transmitter pans even in strong sunlight Light signaling over long distances, for example, has combinations that have at least two wise from 30 km to be able to carry out, a completely different places attached beacons are differentiated Form a wavelength in the UV range and a pre-aligned transmission path, wherein given range of pulse duration is used. This is used by the infrared transmitter and infrared receiver optics known method, however, is for the transmission over fixed opening angles that the Sensehr large distances to an omnidirectional si- 35 which are connected in parallel and at the same time the same signal receiver provided. For an infrared transmission, send data and that the receiver on the output side transmission system from stationary beacons to movable ones, connected in parallel and each indirecting an interfering signal Have light receivers in a certain receiver that blocks that receiver, desfangsbereich with a short transmission distance of sen interfering signals above a given interfering signal less than 50 meters, this transmission method is 40 threshold.

ren not suitable. Error-free information transfer by means of in-

Furthermore, remote control systems, in particular infrared radiation is achieved in that several un-

for actuating the drive device from the garage door, differently oriented transmission paths

Ren, with a light transmitter emitting light pulses, transmitters and receivers are present and each

,; known. For example, in DE-AS 19 43 738 is a 45 that receiver is blocked, the too large Störsi-

such a system described in which to receive interference signals. Therefore, it is advisable to use the

Free reception of the transmission signals Polarization filter allows several transmitter / receiver combinations

be turned. The polarization state can be arranged in such a way that it is different in each case.

the light receiver and light transmitter are aligned with each transmission. With the different locations, both

deimpuls can be changed accordingly. Against bumps, for example, on the left and right edge of the lane

Such a system, however, is road, with beacons arranged several transmissions

not protected. routes formed. The stationary

In the case of an infrared transmission system, a transmitter-receiver combination consists of, for example

■ a fixed transmitter and a movable one attached to the traffic signal masts at a suitable height.

; Receiver or a movable transmitter and a 55 be brought. The respective transmitters are at the inven-

fixed receiver exists, as it is, for example, the information transmission system according to the parallel

is known from DE-OS 30 IO 068, can be switched by upstream IeI and transmit the same information at the same time

: called measures direct sunlight information. Each recipient assigns one or more

the receiver does not always prevent and thus an infrared receiving diodes and among other things a

Safe reception of infrared signals cannot be guaranteed. This recognizes the

be steadily. gnal superimposed infrared interfering components of the sunlight.

It has therefore already been proposed that the interference components consist of a direct signal and

Pressing the Störltchts that in an infrared reception an alternating or noise signal in an approximate

diode, a noise signal in addition to the useful signal has a ratio that is independent of the amplitude. A simple

testifies that a noise suppression circuit arrangement b5 before detection of the alternating or noise signal is we-

to be provided in the receiver. For example, there is no possible similarity to the useful signal

DE-OS 27 59 215 a noise reduction scarf possible.

processing arrangement described, which has a Siebglicd, according to the invention, the equal signal component of the in-

5 6

Infrared interference signal used for this purpose, a by the alternating comparator SK lie next to the one described

or noise component of the interfering signal falsified groove / .si noise signal either correct received signals

signal and then the relevant inhibition or, in the case of disruptive fluids at the entrance of the infra-

to lock ger. On the output side, the respective empowerment receivers are present, no reception signals. Lie

Catcher connected in parallel so that when ^r > received signals are exceeded. they are at output A of the

of the interfering signal via a predetermined interfering signal voltage comparator SK and can either

threshold that recipient is blocked, whose input is additionally amplified or directly to a not shown here.

Infrared receiving diode or diodes of bright surroundings, evaluation circuit arrangement (AWS)

exposure light or sunlight. The or bcn will be.

those receivers whose useful signal is sufficiently io. FIG. 2 also shows a block diagram

is large, are not blocked, so that their output infrared receiver £ similar to Fig.l, but with

signals to a downstream ejection sound system, the difference being that the output of the interference signal indicator

long. kators 5 / connected to the voltage comparator SK

With the system according to the invention for information. If a defined interference transmission by means of infrared radiation is exceeded, it is certain that the span-receiver arrangement and at least one voltage comparator SK are blocked via at least one of several transmitter-useful-noise signal amplitude ratios. so that an information A no signal is present on the transmission path formed by it.

tion transfer and a data exchange take place F i g. 3 shows a possible embodiment of a can. It is advantageous to use the infrared transmitter 2 «infrared receiver. The interfering signal indicator 5 / be and receiving diodes can be predetermined from the indicator resistance Rl and the Reöffnungswinkel to form, which are chosen so that interfering diode IRL, which can hardly penetrate the emitting sunlight via an RC element CS and RS. As a result, the operating voltage U is closed. The indicator wi are defined, limited reception angle and transmitter position Rl and the reception diode IRL form a dekeulen with which the differently designed voltage divider on which the received signal is tapped transmission links between transmitters and fen is generated. A receivers received by the receiving diode IRL are formed. high infrared proportion, e.g. B. light by direct sunlight, according to the invention causes a high chip yield from the subclaims and an- nungsabfall at the indicator resistor R1 and a negotiation of the drawing are explained in more detail below. The shift in the operating point of the receiving diode IRL shows that neither useful signals nor interfering

F i g. 1 a block diagram of a possible receive rendc noise signal amplitudes at the input of the

circuit arrangement. in which the interference signal indicator is stronger. The preamplifier W is on

blocks the output of the preamplifier, the expected useful signal frequency range

Fig. 2 is a receiver block diagram in which the 35 correct amplifier with the transistor TR. After- Störsignaiindikator only processes the output of the voltage com-switched voltage comparator SK

parators locks. Signals that are larger than the built-in diode

F i g. 3 shows a simplified circuit arrangement of the threshold of z. B. 0.65 volts between the cons-receiver according to F i g. 2, R 1 and R 2 would be arranged at the entrances

Fig. 4 a block diagram of three Einpfängerschal- 40 £ 1 and £ 2 of the comparator flying diode Dl. Processing arrangements, which are connected in parallel on the output side, it is advantageous to use the output A of the voltage test to use the comparator SK as an open collector output.

5 shows an arrangement of two beacons and one emp- lead. This enables a parallel catcher or transmitter arrangement on the output side on a motor vehicle, switching of several infrared receivers E. As seen from above, 45 in FIG. 4 are shown.

6 and 7 show an arrangement of a beacon and an in the Figure 4 are three recipient egg to £ 3 according to Receiver or transmitter on a vehicle, of which FIG. 1 is shown. The infrared receiver £ 1 bis Seen from the side, and £ 3 are basically structured in the same way and 8 shows an arrangement of two beacons on the street side connected in parallel, so that at least at the exit

edge with a vehicle, seen from above. 50 A of a receiver £ 1 to £ 3 there is a signal that is in

In the block diagram of FIG. 1, an infrared receiver is connected downstream of the three receivers E \ to £ 3

Catcher shown, in which the infrared diode IRL amplifies an amplifier VER and is used for the evaluation circuit

Preamplifier wound this a voltage comparator A WS is performed.

tor SK are connected downstream. The infrared diode IRL and the three receivers (El to £ 3, as shown in Fig. 4 the preamplifier VV is an interference signal indicator SI Are shown 55) are associated with built up in principle of the same kind, arranged the output of the preamplifier VV and on a vehicle Fso and assembles, the output leads of the Störsignalindikators 5 / affect that the horizontal opening angle FWH 1 and influ- direct amplification and / or frequency - FWH 2 as well as FWH3 of the individual receiver optics output of the preamplifier Wderart that with Oberschrei- 01 to 03 only slightly overlap. This is shown in Fig. There are also two beacons B 1 and B 2 , which are arranged in such a way that the beacon transmitter of the output of the preamplifier W has no signal and transmitter-receiver combination BSE1, R9 £ 2zwci, so that no transmission lines OS1, US3 to the driving loads can be separated from the signal which is faulty due to interference. Due to the high gain of the equipment receiver, the transmitter / receiver combination preamplifier W is connected to its output with an in its 65 FSE 1, FS £ 3 form. Likewise, two mutually gener maximum amplitude known noise signal, separated transmission links US I and US 2 from the vehicle transmitters to the receivers of the two beacons SK is suppressed with the help of the downstream voltage comparator. Present at the entrance of the chipboard. The infrared signals of the beacon transmitter ÖS £ 2

are disturbed by the superimposed interfering signal components caused by sunlight from the sun SON. The receiver FSEi of the vehicle with its optics 03 and an opening angle FWHZ detects this and there was no output signal. The vehicle receiver FSE 1 with its optics 01 and its horizontal aperture angle FlVW 1, however, can receive the signals from the beacon transmitter BSE I undisturbed and evaluate them accordingly. The optical axes of the individual receivers (FSEi to FSE 3 or BSEi and BSE2), both of the vehicle FaIs and the two beacons B 1 and 02, as well as the optics in front of them (01 to 03 on the vehicle; the receiving optics of the beacons are not specifically shown here) are therefore arranged in such a way that interference-free reception of infrared signals can be expected with at least one transmitter / receiver combination. This means that at any point in time the optical opening angle FWH 1 ... FWH 3 of at least one vehicle receiver (FSE1 to FSE3) is not in the range of direct or indirect solar radiation (SON) . In addition, the optics (OP) are also designed accordingly for the vertical opening angle, as shown in FIG. 6 shown.

In Fig. 6 shows the optics OP with an infrared diode IRL of a vehicle receiver FSE arranged behind it. To this end, seen from the side, the beacon B with a transmitter BSE is shown at a certain distance from the vehicle or the optics OP of the vehicle receiver FSE. The horizontal opening angle FWV of the receiver optics OP is selected so that as little direct sunlight SON as possible can reach the infrared receiver diode IRL via the receiver optics OP. For example, an opening angle FWV of approximately 10 ° is provided. The transmitter-Z receiver combination BSE of the beacon Sin is mounted at a corresponding height.

A similar representation is shown in FIG. 7, the beacon transmitter BSE having a transmitting lobe SK . The transmission lobe SK is relatively narrow and aligned so that the upper lobe area runs approximately horizontally parallel to the road and the lower lobe area radiates relatively deep down. The opening angle BWV of the beacon transmitter BSE is also 10 ° here, for example. The vehicle F has, for example, mounted its transmitter / receiver combination FSE behind the windshield. In this way it is possible in the event of a fault due to direct or reflected solar radiation to suppress useful infrared signals, but under no circumstances to emit additional signals. With several receivers connected in parallel, an undisturbed infrared transmission is possible, as explained above. The direction of propagation of the infrared scan signal from the beacon transmitter is preferably opposite to the direction of movement of the mobile vehicle receiver. The direction of propagation of the infrared transmitter signals from the vehicle's transmitter is in the direction of movement of the vehicle. In this way it is possible that a data exchange between beacon B and vehicle F can take place relatively early when a vehicle drives into the transmission range of the beacon

This is again in FIG. 8 illustrates

In FIG. 8 is seen from above indicated a road, at the right and left edges respectively a beacon Bl and B 2 is arranged this case, each beacon transmitter / on receiver combination BSE 1 and BSE2 a relatively wide transmit beam, which in each case an opening angle BWHi and BWH2 in the horizontal direction. The radiation characteristics of the beacon transmitters BSEX and BSE2 are designed so that each leg of the transmitter opening angle BWH 1. BWH 2 runs almost parallel to the roadside, while the other two legs extend very close to the opposite beacon B 1 and B 2 , so that a tear-off edge ARK results in this area. In the radiation area of the two transmitters or receivers BSE \, BSE2 of the beacons Bi and B2 is the vehicle F, which here hinted at only two scanner / receiver combinations FSE 1 and FSE2 . The infrared signal of the two transmitters BSEi and BSE 2 received in the moving motor vehicle F will steadily increase in amplitude when entering the reception area. When driving through the in F i g. 8, the tear-off edge ARK shown in the immediate vicinity of the beacons B 1 and B 2 , the amplitude of the infrared signal received abruptly breaks off. The vehicle F has left the transmission range of the beacons Bl, B 2. According to the invention, this process is evaluated in the infrared transmission to determine the exact position of the vehicle. An on-board computer, not described in detail here, determines the exact position of the vehicle from this and saves it for further calculations.

For this purpose 3 sheets of drawings

Claims (1)

Patent claims: 1. System for information transmission by means of infrared radiation with modulated information data between stationary beacons and vehicles that each with a transmitter / receiver combination are equipped, thereby marked